“The Four Horsemen of the Apocalypse are described in the last book of the New Testament of the Bible, called the Book of Revelation of Jesus Christ to Saint John the Evangelist, at 6:1-8. The chapter tells of a book or scroll in God’s right hand that is sealed with seven seals. The Lamb of God, or Lion of Judah, opens the first four of the seven seals, which summons four beings that ride out on white, red, black, and pale horses.
The first horseman is called Pestilence, and is associated with infectious disease and plague. Some translations of the Bible mention ‘plague’ or ‘pestilence’ in connection with the riders in the passage following the introduction of the fourth rider; cf. ‘They were given power over a fourth of the earth to kill by sword, famine, plague, and by the wild beasts of the earth.’
The rider of the second horse is often taken to represent War or mass slaughter. The color red, as well as the rider’s possession of a great sword, suggests blood that is to be spilled. The sword held upward by the second horseman may represent war or a declaration of war, as seen in heraldry.
The third horseman rides a black horse and is popularly understood to be Famine as the horseman carries a pair of balances or weighing scales, indicating the way that bread would have been weighed during a famine.
The fourth and final horseman is named Death. Known as ‘the pale rider’,  of all the riders, he is the only one to whom the text itself explicitly gives a name. The color of Death’s horse is written as khlōros… several scholars suggest that the color reflects the sickly pallor of a corpse.”